SI Defense manufactures AR-15 lower and upper receivers that are machined out of solid aluminum billet blocks.
Two soon-to-be receivers being sprayed with coolant by the CNC machine
They have photos of the process and a video showing the CNC machine in operation. Very interesting.
Thanks to Health for the link.
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They should take full advantage of the billet 6061-T6 aluminum. It allows interesting designs to be produce.
I’d like to have one billet lower just because of the cool factor!